Add CMakeLists.txt and answer for problem 1

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+
+project(practice_exam_2 C)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_executable(${PROJECT_NAME})
+
+file(GLOB proj_sources LIST_DIRECTORIES false CONFIGURE_DEPENDS src/*.c)
+set(proj_include "include")
+
+# Add sources to target
+target_sources(${PROJECT_NAME} PRIVATE "${proj_sources}")
+target_include_directories(${PROJECT_NAME} PRIVATE "${proj_include}")
+

include/p1.h

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+#ifndef P1_H
+#define P1_H
+
+int count_alphanumeric(const char* str);
+
+#endif
+

src/main.c

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+#include <stdio.h>
+
+#include "p1.h"
+
+int main(void) {
+	// Problem 1
+	int num_alphanum = count_alphanumeric("Hello World!!");
+	printf("Number of alphanumeric characters in \"Hello World!!\": %d\n", num_alphanum);
+
+	// Problem 2
+
+	return 0;
+}
+

src/p1.c

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+#include "p1.h"
+
+#include <ctype.h>
+
+int count_alphanumeric(const char* str) {
+	int num_alphanumeric = 0;
+	const char* current = str;
+
+	while (*current != '\0') {
+		if (isalnum(*current)) {
+			++num_alphanumeric;
+		}
+
+		++current;
+	}
+
+	return num_alphanumeric;
+}
+