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How to resolve LINK2019: unresolved external symbol error when compiling an Adams subroutine?

I am getting an error of LINK2019 while compiling my subroutine which consists of c_sysfnc, c_errmes and c_step functions. I have already included the "slv_c_utils.h" header file. Do I need to include any other header files and in such case which one? Since the "slv_c_utils.h" file contains only declaration of these functions and not their definitions. I am using Adams command prompt and Visual studio to compile. Do I need to import any module before compiling?
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The below picture shows how the functions are called in the c code, do I need to add any prefix before calling these functions?
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