fix string issue

Author: adarshxs

deep-gemm/csrc/jit_kernels/impls/runtime_utils.hpp

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <cmath>
+#include <cstdio>
 #include <cuda.h>
 #include "../../utils/torch_compat.hpp"
 
@@ -64,8 +66,12 @@ static std::string to_string(const at::ScalarType& dtype) {
 static std::string to_string(const float& v) {
     if (std::isfinite(v)) {
         char buffer[32];
-        std::snprintf(buffer, sizeof(buffer), "%.9gf", v);
-        return buffer;
+        std::snprintf(buffer, sizeof(buffer), "%.9g", v);
+        std::string literal = buffer;
+        if (literal.find_first_of(".eE") == std::string::npos)
+            literal += ".0";
+        literal += "f";
+        return literal;
     } else if (std::isinf(v)) {
         return v > 0 ? "cute::numeric_limits<float>::infinity()"
                      : "-cute::numeric_limits<float>::infinity()";