#!/bin/bash
s='name: amit 
phone: 0000000000'

awk -F\: '
{ 
    for (i=1; i<=NF; i++)  {
        gsub(/^[[:blank:]]+|[[:blank:]]+$/, "", $i)
        a[NR,i] = $i
    }
}
NF>p { p = NF }
END {    
    for(j=1; j<=p; j++) {
        str=a[1,j]
        for(i=2; i<=NR; i++){
            str=str","a[i,j];
        }
        print str
    }
}' <<< "$s"