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void str_cat(char** dest, const char* source)
{
    size_t destLength = strlen(source);
	if (dest != NULL)
	{
		destLength += strlen(*dest);
	}
	char* temp = malloc(destLength + 1);  //allocates enough memory for the old string + new string
	if (temp != NULL)
	{
		strcat(temp,source);
	}
	free(*dest);
	*dest = temp;
}

prog.cpp: In function ‘void str_cat(char**, const char*)’:
prog.cpp:3: error: ‘size_t’ was not declared in this scope
prog.cpp:3: error: expected `;' before ‘destLength’
prog.cpp:4: error: ‘NULL’ was not declared in this scope
prog.cpp:6: error: ‘destLength’ was not declared in this scope
prog.cpp:6: error: ‘strlen’ was not declared in this scope
prog.cpp:8: error: ‘destLength’ was not declared in this scope
prog.cpp:8: error: ‘malloc’ was not declared in this scope
prog.cpp:9: error: ‘NULL’ was not declared in this scope
prog.cpp:11: error: ‘strcat’ was not declared in this scope
prog.cpp:13: error: ‘free’ was not declared in this scope

Standard output is empty