remove forward declarations
diff --git a/src/string_util.h b/src/string_util.h
index 508acef..6d35da2 100644
--- a/src/string_util.h
+++ b/src/string_util.h
@@ -7,14 +7,6 @@
namespace benchmark {
-void ToExponentAndMantissa(double val, double thresh, int precision,
- double one_k, std::string* mantissa, int* exponent);
-
-std::string ExponentToPrefix(int exponent, bool iec);
-
-std::string ToBinaryStringFullySpecified(double value, double threshold,
- int precision);
-
void AppendHumanReadable(int n, std::string* str);
std::string HumanReadableNumber(double n);