task 1 completed

axis/task1.c

@@ -0,0 +1,59 @@
+#include <string.h>
+#include <stdio.h>
+
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include <stdbool.h>
+
+int solution(char *str) {
+    static const size_t LEN = 3;
+    static const char* one  = "one";
+    static const char* two  = "two";
+    int operand[2] = {0, 0};
+    int operand_index = 0;
+    char op = 0x00;
+
+    char* ptr = str;
+    while (*ptr != '\0') {
+        int cmp = strncmp(ptr, one, LEN);
+        if (cmp == 0) {
+            operand[operand_index++] = 1;
+            ptr += LEN;
+        }
+        cmp = strncmp(ptr, two, LEN);
+        if (cmp == 0) {
+            operand[operand_index++] = 2;
+            ptr += LEN;
+        }
+
+        if (operand_index == 2) {
+            operand_index = 0;
+            int a = operand[0];
+            int b = operand[1];
+            int res = 0;
+            if (op == '+') res = a + b;
+            else res = a - b;
+            operand[operand_index++] = res;
+        }
+
+        if (*ptr == '+') {
+            op = '+';
+        } else if (*ptr == '-') {
+            op = '-';
+        } else {
+            assert(true && "Invalid parsing!");
+        }
+        ++ptr;
+
+    }
+
+    return operand[0];
+}
+
+int main() {
+    char* str = "one+two-one-one+two+one";
+    int ret = solution(str);
+    printf("input: %s = %d\n", str, ret);
+    return 0;
+}