Update readme and function naming

Author: thorsphere

README.md

@@ -73,7 +73,7 @@ func (code *Code) Assignment(a *AssignmentArgs) *Code
 func (code *Code) CompositeLit(LiteralType string) *Code
 func (code *Code) ShortVarDecl(a *ShortVarDeclArgs) *Code
 func (code *Code) KeyedElement(a *KeyedElementArgs) *Code
-func (code *Code) Testvariables(t *Testvars) *Code
+func (code *Code) TestVarDecl(t *Testvars) *Code
 func (code *Code) Format() error
 func (code *Code) String() string
 ```

syntax_nil_test.go

@@ -17,7 +17,7 @@ func TestTestVariablesNil(t *testing.T) {
 	// Declare c as type *Code and assign nil
 	var c *lpcode.Code = nil
 	// The test fails if Testvariables does not return nil.
-	if n := c.TestvarDecl([]lpcode.Testvar{}); n != nil {
+	if n := c.TestVarDecl([]lpcode.Testvar{}); n != nil {
 		t.Error(tserr.NilExpected("Testvariables"))
 	}
 }
@@ -202,7 +202,7 @@ func TestSelMethodNil(t *testing.T) {
 // t is nil. The test fails if Testvariables does not return nil.
 func TestTestVariablesNil2(t *testing.T) {
 	// The test fails if Testvariables does not return nil.
-	if n := lpcode.NewCode().TestvarDecl(nil); n != nil {
+	if n := lpcode.NewCode().TestVarDecl(nil); n != nil {
 		t.Error(tserr.NilExpected("Testvariables"))
 	}
 }

syntax_test.go

@@ -46,7 +46,7 @@ func TestTestVariables(t *testing.T) {
 		{T: "float64", N: "floatFoo", V: "5678"},
 	}
 	// Retrieve test variables with Testvariables
-	c := lpcode.NewCode().TestvarDecl(vars)
+	c := lpcode.NewCode().TestVarDecl(vars)
 	// Evaluate the retrieved source code
 	if e := evalCode(c, "testvariables"); e != nil {
 		// The test fails if the retrieved code does not match the contents of the golden file
@@ -211,7 +211,7 @@ func TestTestVariablesEmpty(t *testing.T) {
 	// // Configure Testvars to generate no test variables
 	vars := []lpcode.Testvar{}
 	// Retrieve test variables with Testvariables
-	c := lpcode.NewCode().TestvarDecl(vars)
+	c := lpcode.NewCode().TestVarDecl(vars)
 	// The test fails in case the returned string is not empty
 	if c.String() != "" {
 		t.Error(tserr.Empty("code"))

testvar.go

@@ -16,7 +16,7 @@ type Testvar struct {
 // It returns nil if code is nil or if tv is nil.
 // The generated variable declarations are added to code.
 // The test variables are generated based on the type, name and value specified in tv. If no test variables are generated, an empty string is returned. The generated code should be validated by go/format or other tools. The test variables are generated in a var block. Each test variable is declared with its name, type and value, followed by a comment indicating the type of the test variable. The generated code can be used for unit tests to provide consistent test variables across different test cases.
-func (code *Code) TestvarDecl(tv []Testvar) *Code {
+func (code *Code) TestVarDecl(tv []Testvar) *Code {
 	// Return nil in case code is nil
 	if code == nil {
 		return nil