contruct a cubic spline from the given discrete data. And find the value $of$ the function $at0\mathrm{.}25,0\mathrm{.}45,0\mathrm{.}75,0\mathrm{.}95.$ assume that the second derivative $at$ both ends $is$ equal $to$ the value $of$ the second derivative $at$ its vicinity. $(\backslash$gamma $0=\backslash$gamma $1,\backslash$gamma n $=\backslash$gamma n$1)($Please use C programming for basic level$)$