DDTank 65 angle perfect

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>


bool isinarray(char *ch, char **arr, int size) {
    for (int i=0; i<size; i++) {
        if (ch[1] == arr[i][1])
            return true;
    }
    return false;
}

// sys args => (distance, windForce, directions)
int main (int argc, char *argv[]) {
    // variables
    int distance = 0, angle = 65;
    float windForce = 0.0;
    float strength[21] = {13, 21, 26, 31.5, 37, 41, 44, 48.5, 53, 56,
                            58, 61, 64, 67, 70, 73, 76, 79, 82, 85};
    char *directions = " ";
    char charDirection = ' ', windDirection = ' ';
    // logic
    if (argc == 4) {
        distance = atoi(argv[1]);
        windForce = atof(argv[2]);
        directions = argv[3];
        if ((distance >= 0) && (distance <= 20)) {
            if (strlen(directions) == 3) {
                charDirection = directions[0];
                windDirection = directions[2];
                if (charDirection != windDirection)
                    angle -= windForce / 0.5;
                else if (charDirection == windDirection)
                    angle += windForce / 0.5;
                printf("%.1fF | %dA\n", strength[distance], angle);
            } else
                printf("Sentido do personagem e/ou do vento nao detectado!\n");
        } else
            printf("Distancia fora do limite!\n");
    } else {
        if (isinarray("-h", argv, argc))
            printf("Para usar o script é necessário os seguintes argumentos:\n\t(1) distancia\n\t(2) forca do vento\n\t(3) direcao_personagem,direcao_vento\n");
        else
            printf("Esse script requer argumentos\n");
    }
    return 0;
}