fix: fix some minor issues

1. Removed the unnecessary note from README. Because f32(1e-44) = 9.809e-45 which is not a power of 10 — it's just the nearest float32 value (7 * 2^-149). Truncating it to 1.401e-45 (10^-45)
2. Remove the unnecessary test case.
3. Put a f32 wrapper around the return computation in main.js
4. Put f after floating number in main.c and readme.md

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: passed
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: passed
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: nirmaljb

lib/node_modules/@stdlib/math/base/special/trunc10f/README.md

@@ -78,15 +78,6 @@ v = trunc10f( NaN );
 
 <section class="notes">
 
-## Notes
-
--   The function may not return accurate results for subnormals due to a general loss in precision.
-
-    ```javascript
-    var v = trunc10f( 1.0e-46 ); // should return 1.0e-46
-    // returns 0.0
-    ```
-
 </section>
 
 <!-- /.notes -->
@@ -145,7 +136,7 @@ logEachMap( 'x: %0.4f. Rounded: %0.4f.', x, trunc10f );
 Rounds a `single-precision` floating point number to the nearest power of `10` toward zero.
 
 ```c
-float y = stdlib_base_trunc10f( -4.2 );
+float y = stdlib_base_trunc10f( -4.2f );
 // returns -1.0
 ```
 

lib/node_modules/@stdlib/math/base/special/trunc10f/lib/main.js

@@ -67,7 +67,7 @@ function trunc10f( x ) {
 	} else {
 		sign = ONE;
 	}
-	return sign * powf( TEN, floorf( f32( log10( x ) ) ) );
+	return f32( sign * powf( TEN, floorf( f32( log10( x ) ) ) ) );
 }
 
 

lib/node_modules/@stdlib/math/base/special/trunc10f/src/main.c

@@ -30,7 +30,7 @@
 * @return     rounded value
 *
 * @example
-* float y = stdlib_base_trunc10f( 13.0 );
+* float y = stdlib_base_trunc10f( 13.0f );
 * // returns 10.0
 */
 float stdlib_base_trunc10f( const float x ) {
@@ -47,5 +47,5 @@ float stdlib_base_trunc10f( const float x ) {
 	} else {
 		sign = 1.0f;
 	}
-	return sign * stdlib_base_powf( 10.0f, stdlib_base_floorf( stdlib_base_log10( xc ) ) );
+	return sign * stdlib_base_powf( 10.0f, stdlib_base_floorf( (float)stdlib_base_log10( xc ) ) );
 }

lib/node_modules/@stdlib/math/base/special/trunc10f/test/test.js

@@ -125,17 +125,6 @@ tape( 'the function supports rounding subnormal values', function test( t ) {
 	t.end();
 });
 
-tape( 'the function may return incorrect results for small subnormals', function test( t ) {
-	var x;
-	var v;
-
-	x = powf( 10.0, -44 );
-	v = trunc10f( x );
-	t.notEqual( v, x, 'should return input value but does not due to loss in precision' );
-
-	t.end();
-});
-
 tape( 'the function rounds a single-precision floating point number to the nearest power of 10 toward zero', function test( t ) {
 	t.strictEqual( trunc10f( -4.2 ), -1.0, 'returns expected value' );
 	t.strictEqual( trunc10f( -4.5 ), -1.0, 'returns expected value' );