My_Atoi.go

// pseudo code
// strip string of white space
// check first character for sign
// loop through remaining string until the end or a non integer value
// check ascii value of each character and ensure it falls in proper range
// then offset the ascii value from the ascii of 0
// return new integer with sign 1 or -1
func myAtoi(str string) int {
    finalString:= ""
    sign:= 1
    // Trim whitespace from string
    remainingString := strings.TrimSpace(str)
    // Check if string is now empty
    if remainingString == ""{
        return 0
    }

    // check first digit to see if it is a sign or a number
    switch(remainingString[0]){
    // if first rune is a positive digit copy string to finalString
    case '0','1','2','3','4','5','6','7','8','9':
        finalString= remainingString
    // if first rune is a +, copy the string excluding the +
    case '+':
        finalString = remainingString[1:]
    // if first rune is a -, copy the string excluding the -
    case '-':
        finalString= remainingString[1:]
        sign = -1
    // if the first rune is anything else, this is a bad string
    default:
        fmt.Printf("Bad string")
        return 0
    }
    for idx, runeValue := range finalString{
        // loop until we find a non numeric rune or code point
        // single digit int values range from '0'-'9'
        if runeValue < '0' || runeValue > '9'{
            finalString = finalString[:idx]
            break
        }
    }
    returnVal := 0
    // loop through the remainging string and covert to an integer
    for _,rVal := range finalString{
        // ensure to subtract the ascii val of '0' before converting to int
        returnVal = returnVal*10 + int(rVal-'0')
        // save some compute for long string values, check after each loop
        if sign == 1 && returnVal > math.MaxInt32{
            return math.MaxInt32
        }else if sign == -1 && sign * returnVal < math.MinInt32{
            return math.MinInt32
        }
    }
    // finally return apply the sign
    return returnVal * sign
    
}