Calculate the sum of squares of positive numbers in golang without using for statement

squares.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	n, _ := reader.ReadString('\n')
	n = strings.TrimRight(n, "\r\n")
	test_cases, err := strconv.Atoi(n)
	if err != nil {
		fmt.Println(err)
	}
	process_test_case(test_cases, reader)
}

func process_test_case(test_cases int, reader *bufio.Reader) {
	if test_cases != 0 {
		_, _ = reader.ReadString('\n')
		input, _:= reader.ReadString('\n')
		input = strings.TrimRight(input, "\r\n")
		arr := strings.Split(input,  " ")
		ans := process_array(arr, 0)
		fmt.Println(ans)
		test_cases -= 1
		process_test_case(test_cases, reader)
	}
}

func process_array(arr []string, result int) int {
	num, _ := strconv.Atoi(arr[0])
	if len(arr) > 1 {
		next := arr[1:]
		if num < 0 {
			num = 0
		}
		result = num * num + process_array(next, result)
		return result
	} else {
		if num >= 0 {
			return num * num
		}
		return 0
	}
}

//