Minor code cleanup to use interpolated string formatting.
Minor code cleanup to use interpolated string formatting.

ddobrev/CppSharp,mono/CppSharp,mohtamohit/CppSharp,mohtamohit/CppSharp,ddobrev/CppSharp,mono/CppSharp,mohtamohit/CppSharp,zillemarco/CppSharp,zillemarco/CppSharp,mohtamohit/CppSharp,zillemarco/CppSharp,mono/CppSharp,mono/CppSharp,mono/CppSharp,ddobrev/CppSharp,zillemarco/CppSharp,zillemarco/CppSharp,mono/CppSharp,ddobrev/CppSharp,ddobrev/CppSharp,mohtamohit/CppSharp