SOURCE

function childNum (str) {
    console.log(str)
    const result = []
    const childStr = str.trim()
    if(str.length === 0 || childStr.length === 0) {
        return []
    }
    const childStrArr = (str) => {
        conole.log(str)
        if(str.length === 1) {
            return str
        }
        result.pu
        str.forEach((i,index) => {

        })
    }
}

// console.log(childNum())